Ios 项目赢得'；重新单击按钮后更新

我的程序运行完全正常，只是如果我重新点击“回车”按钮，它不会再次更新。我第一次单击它时，它就工作了，但第二次不工作

代码如下：

import UIKit

class ViewController: UIViewController, NSURLConnectionDelegate {

lazy var data = NSMutableData()

@IBOutlet weak var searchField: UITextField!

@IBOutlet weak var name: UILabel!

@IBOutlet weak var summonerLevel: UILabel!

@IBOutlet weak var profileIconId: UILabel!

@IBAction func enterButton(sender: AnyObject) {

    startConnection()

}

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
}

override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

func startConnection(){
    println("start connection began")
    let urlPath: String = "https://na.api.pvp.net/api/lol/na/v1.4/summoner/by-name/" + searchField.text + "?api_key=dd5bf142-df4a-4eed-be7f-8f6f908dcfe6"
    var url: NSURL = NSURL(string: urlPath)!
    var request: NSURLRequest = NSURLRequest(URL: url)
    var connection: NSURLConnection = NSURLConnection(request: request, delegate: self, startImmediately: false)!
    connection.start()
}

func connection(connection: NSURLConnection!, didReceiveData data: NSData!){
    self.data.appendData(data)
}

func buttonAction(sender: UIButton!){
    startConnection()
}

func connectionDidFinishLoading(connection: NSURLConnection) {

    var err: NSError?

    if let jsonResult = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: &err) as? NSDictionary,
        let include = jsonResult.objectForKey(searchField.text) as? NSDictionary {
            //where the program stops running after I click enter the second time (it doesn't literally 'stop' running, it just doesn't execute the rest of this code, keep in mind its the second time I click enter with a new username in the textfield value)
            if let name1 = include[ "name" ] as? String {
                name.text = name1
                println(name1)
            }

            if let summLevel = include[ "summonerLevel" ] as? NSNumber {
                summonerLevel.text = "\(summLevel.integerValue)"
                println(summLevel)

            }
            if let profIconId = include[ "profileIconId" ] as? NSNumber {
                profileIconId.text = "\(profIconId.integerValue)"
                println(profIconId)
            }
    }
}

以下是我正在解析的内容（我认为它没有任何用处，只是以防万一）：

我想让程序做的是，当我为textfield键入不同的值并单击“Enter”时，我想让它用新信息更新。我曾尝试将let值更改为vars，但这似乎不起作用

这是我第一次在iOS模拟器中输入值并单击“回车”时的样子：

这是我第二次输入新值并单击“回车”时的外观，实际上没有任何变化/发生：

---

我认为有两个问题：

一个问题是，您可以在按钮完成之前单击两次

另一个是，您总是在累积变量数据，而不是清空它

我在代码中添加了一些可能有用的注释

import UIKit
class ViewController: UIViewController, NSURLConnectionDelegate {
lazy var data = NSMutableData()
@IBOutlet weak var searchField: UITextField!
@IBOutlet weak var name: UILabel!
@IBOutlet weak var summonerLevel: UILabel!
@IBOutlet weak var profileIconId: UILabel!
//Create a new outlet to the Button
@IBOutlet weak var enterButton: UIButton!

@IBAction func enterButton(sender: AnyObject) {
    //disable the button until the request finishes
    enterButton.enable = false
    //Clear the old data from data
    data.setData(NSData())
    startConnection()
}

func startConnection(){
    println("start connection began")
    let urlPath: String = "https://na.api.pvp.net/api/lol/na/v1.4/summoner/by-name/" + searchField.text + "?api_key=dd5bf142-df4a-4eed-be7f-8f6f908dcfe6"
    var url: NSURL = NSURL(string: urlPath)!
    var request: NSURLRequest = NSURLRequest(URL: url)
    var connection: NSURLConnection = NSURLConnection(request: request, delegate: self, startImmediately: false)!
    connection.start()
}

func connection(connection: NSURLConnection!, didReceiveData data: NSData!){
    self.data.appendData(data)
}

//You don't need this you already have an outlet
func buttonAction(sender: UIButton!){
    startConnection()
}

func connectionDidFinishLoading(connection: NSURLConnection) {

    var err: NSError?

    if let jsonResult = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: &err) as? NSDictionary,
        let include = jsonResult.objectForKey(searchField.text) as? NSDictionary {
            //where the program stops running after I click enter the second time (it doesn't literally 'stop' running, it just doesn't execute the rest of this code, keep in mind its the second time I click enter with a new username in the textfield value)
            if let name1 = include[ "name" ] as? String {
                name.text = name1
                println(name1)
            }

            if let summLevel = include[ "summonerLevel" ] as? NSNumber {
                summonerLevel.text = "\(summLevel.integerValue)"
                println(summLevel)

            }
            if let profIconId = include[ "profileIconId" ] as? NSNumber {
                profileIconId.text = "\(profIconId.integerValue)"
                println(profIconId)
            }
            //re-enable the button for new requests 
            enterButton.enable = true
    }
}

---

好消息！很高兴我能帮上忙，祝你顺利完成你的应用程序！：）

import UIKit
class ViewController: UIViewController, NSURLConnectionDelegate {
lazy var data = NSMutableData()
@IBOutlet weak var searchField: UITextField!
@IBOutlet weak var name: UILabel!
@IBOutlet weak var summonerLevel: UILabel!
@IBOutlet weak var profileIconId: UILabel!
//Create a new outlet to the Button
@IBOutlet weak var enterButton: UIButton!

@IBAction func enterButton(sender: AnyObject) {
    //disable the button until the request finishes
    enterButton.enable = false
    //Clear the old data from data
    data.setData(NSData())
    startConnection()
}

func startConnection(){
    println("start connection began")
    let urlPath: String = "https://na.api.pvp.net/api/lol/na/v1.4/summoner/by-name/" + searchField.text + "?api_key=dd5bf142-df4a-4eed-be7f-8f6f908dcfe6"
    var url: NSURL = NSURL(string: urlPath)!
    var request: NSURLRequest = NSURLRequest(URL: url)
    var connection: NSURLConnection = NSURLConnection(request: request, delegate: self, startImmediately: false)!
    connection.start()
}

func connection(connection: NSURLConnection!, didReceiveData data: NSData!){
    self.data.appendData(data)
}

//You don't need this you already have an outlet
func buttonAction(sender: UIButton!){
    startConnection()
}

func connectionDidFinishLoading(connection: NSURLConnection) {

    var err: NSError?

    if let jsonResult = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: &err) as? NSDictionary,
        let include = jsonResult.objectForKey(searchField.text) as? NSDictionary {
            //where the program stops running after I click enter the second time (it doesn't literally 'stop' running, it just doesn't execute the rest of this code, keep in mind its the second time I click enter with a new username in the textfield value)
            if let name1 = include[ "name" ] as? String {
                name.text = name1
                println(name1)
            }

            if let summLevel = include[ "summonerLevel" ] as? NSNumber {
                summonerLevel.text = "\(summLevel.integerValue)"
                println(summLevel)

            }
            if let profIconId = include[ "profileIconId" ] as? NSNumber {
                profileIconId.text = "\(profIconId.integerValue)"
                println(profIconId)
            }
            //re-enable the button for new requests 
            enterButton.enable = true
    }
}